If you abstain from all sex outside of marriage as the Church teaches, the use of contraception becomes superfluous for protecting from AIDS. Within marriage, it makes no sense to protect from AIDS unless you know your spouse has the disease. Yet, if you know that you partner has AIDS, you can always abstain from sexual activity with him or her, and avoid the disease. While this might be difficult to do, the difficulty seems worth it.
This argumentation becomes even more clear when the efficacy of contraception is considered. While contraceptive methods such as condoms might significantly lower you chances of contracting AIDS, the risk is still there. Over time, if you are having sex, the odds that you will contract AIDS (or some other disease) even with contraception in place are against you. This makes the Catholic Church's advocacy of celibacy even more justifiable.
Yes, the Catholic Church's policy on contraception is appropriate in the context of HIV/AIDS, because there is no risk of contracting HIV/AIDS if a person follows the policy. It is appropriate for the Catholic church to take the position that they believe to be correct based on doctrine, even if that opinion is not popular. The Church cannot bow to public pressure.
Unfortunately, the Catholic church's policy on contraceptives is inappropriate with considerations to HIV and AIDS. Both diseases are guaranteed to transmit from partner to partner if they're not using contraceptives of some sort. For that reason, individuals shouldn't listen to the Catholic church's policy on protection because it could lead to a person contracting these harmful diseases.